Ruskin mixing track on a slope (3,3)

I believe the answer is:

ski run

I'm a little stuck... Click here to teach me more about this clue!

'track on a slope' is the definition.
'ski run' can be an answer for 'track' (ski run is a kind of track). I am not certain of the 'on a slope' bit.

'ruskin mixing' is the wordplay.
'mixing' indicates anagramming the letters.
'ruskin' anagrammed gives 'SKI RUN'.

Can you help me to learn more?

(Other definitions for ski run that I've seen before include "Boggy, swampy" , "Downhill course in winter" , "Piste" , "Winter sports slope" , "Recreational snow slope" .)

I've seen this clue in the Irish Times.

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